Micellar Morphology in the Presence of Salts and Organic Additives

Kumar, Sanjeev; Naqvi, and Andleeb Z.; Kabir-ud-Din, †

doi:10.1021/la991071i

Cited by 46 publications

(34 citation statements)

References 37 publications

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“…They observed that an ionic surfactant increases the CP of TX-100 and the addition of an electrolyte diminishes the increase in CP. Kabir-ud-din et al [17,18] conducted a systematic study of micellar association due to the simultaneous presence of salts and organic additives and reported the combined effect of salts and organic additives on the micellar growth. In the present work, an effort was made to understand the interaction between solvent and additives leading to change in solubility and CP of TX-100.…”

Section: Introductionmentioning

confidence: 99%

Organic Additives and Electrolytes as Cloud Point Modifiers in Octylphenol Ethoxylate Solutions

Mahajan

Vohra

Kaur

et al. 2008

J Surfact & Detergents

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Cloud point measurements of nonionic surfactant Triton X-100, an octylphenol ethoxylate, were carried out in the absence and presence of various organic additives such as n-alkanols (methanol, ethanol, propanol and butanol), glycols (ethylene glycol, diethylene glycol and triethylene glycol), glycol ethers (ethylene glycol monomethyl ether, ethylene glycol monoethyl ether and ethylene glycol monobutyl ether (EGMBE)) and electrolytes (LiCl, KCl, NaF, NaCl, NaBr, NaI, MgCl 2 and AlCl 3 ). The combined effect of these organic additives and electrolytes on cloud point (CP) measurement was also investigated. The effect of nature of cation, anion and valency of cation on CP is also reported. Among the n-alkanols and glycol ethers as additives, n-butanol and EGMBE were found to decrease the CP while all other additives increase the cloud point. The addition of electrolytes (LiCl, NaCl and KCl) to the solution of Triton X-100 (TX-100) decreases the CP but the rate of decrease in CP with concentration does not follow the lyotropic series of effect. Sodium halides (except NaI) also decrease the CP and the rate of decrease follows the lyotropic series of effect even in the presence of organic additives. NaI is a water structure breaker, hence it increases the cloud point. Further, cations of increasing valency lessen the depression in CP of TX-100 with the rate of decrease in CP following the order Na + [ Mg 2+ [ Al 3+ even in the presence of organic additives.

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Section: Introductionmentioning

confidence: 99%

Organic Additives and Electrolytes as Cloud Point Modifiers in Octylphenol Ethoxylate Solutions

Mahajan

Vohra

Kaur

et al. 2008

J Surfact & Detergents

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“…SDS, sodium bromide (NaBr), and tetra-n-butylammonium bromide (Bu 4 NBr) were the same as used earlier (29). All other chemicals, namely, urea, thiourea, n-propanol (PrOH), n-butanol (BuOH), and n-pentanol (PeOH), were of the best analytical grade available.…”

Section: Methodsmentioning

confidence: 99%

Additive‐induced association in unconventional systems: A case of the hydrotrope

Kumar

Parveen

Kabir-ud-Din

2005

J Surfact & Detergents

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It is well known that hydrotropes have a very high minimum hydrotrope concentration (MHC), posing a question on their applications. We have found that MHC (obtained by conductivity and surface tension measurements) can be reduced by the addition of foreign materials. The association tendency can be improved by the addition of salts, n-alkanols, and ureas. Urea decreases or increases the MHC depending on whether the urea content is lower or higher (e.g., the increased solubility of sparingly soluble riboflavin corroborates the increase in the hydrotropic properties of the system). In the present work, the association tendencies of sodium salicylate (a well-known hydrotrope), sodium dodecyl sulfate, and sodium bromide were compared. The results have direct implications in the mechanism of protein denaturation and may provide insight into the role of urea in supramolecular assemblies.The word hydrotropy was first used by Neuberg (1). This term is used to describe the phenomenon of increasing aqueous solubility of otherwise sparingly soluble organic compounds in solutions of certain organic salts (2). These salts, called hydrotropes, include sodium, potassium, calcium, and ammonium salts of aromatic acids or phenols. McKee (3) concluded that a rather high content of hydrotrope in water is required for its action to be displayed and that the phenomenon is similar to the salting-in process. Booth and Everson (4) showed that the solubility increase does not occur monotonically with hydrotrope concentration, but displays a sigmoidal character. Furthermore, hydrotrope aggregation is responsible for the increase in aqueous solubility that occurs beyond a certain hydrotrope concentration termed the minimum hydrotrope concentration (MHC), analogous to the critical micelle concentration (CMC) for a surfactant (5). Reviews are now available detailing the progress in hydrotrope research (6-11).The aqueous solubility of surfactants is limited by the formation of a liquid crystalline phase, which can be destabilized in the presence of a typical hydrotrope. The enhanced disorder resulting from the residence of the hydrotrope in the association structure of the condensed phase brings about morphological changes from liquid crystal to oil-in-water and bicontinuous regions (11,12). Guo et al. (11) observed that the addition of vitamin C (a hydrotrope) to a cetyltrimethylammonium bromide/1-pentanol/p-xylene/water system caused the area of micellar and inverse micellar regions to increase and ultimately coalesce, whereas the liquid crystalline region shrank.Many attempts have been made to compare hydrotropes with conventional surfactants over the past 45 years (13-16). Danielsson and Stenius (17) observed the aggregation behavior of sodium carboxylates and reported that octanoate and higher members form micelles whereas lower ones form hydrotropes. Firman et al. (18) concluded that a clear distinction between a simple hydrotropic salt and a conventional surfactant is difficult to make. In most cases, hydrotropes have a strong ionic g...

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“…These observations are in good agreement with the data obtained as a function of SDS and added NaCl concentration. The aggregation behavior of SDS in aqueous solution in the presence of various organic additives is well documented [24][25][26]. The solubilization of alcohols in SDS micelles and subsequent effect to micellization and morphological features is investigated by different analytical methods [27][28][29][30].…”

Section: Influence Of Dodecyl Alcohol (C12oh) On Concentration Of Submentioning

confidence: 99%

Submicellar aggregates in aqueous sodium dodecyl sulphate solutions: Investigations by dynamic light scattering and water penetration through porous media

Mehta

Bharatiya

Parekh

et al. 2016

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Micellar Morphology in the Presence of Salts and Organic Additives

Cited by 46 publications

References 37 publications

Organic Additives and Electrolytes as Cloud Point Modifiers in Octylphenol Ethoxylate Solutions

Organic Additives and Electrolytes as Cloud Point Modifiers in Octylphenol Ethoxylate Solutions

Additive‐induced association in unconventional systems: A case of the hydrotrope

Submicellar aggregates in aqueous sodium dodecyl sulphate solutions: Investigations by dynamic light scattering and water penetration through porous media

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